Klassada DirectDispatch mexanizmini qanday amalga oshirish mumkin?

iOS'dagi DirectDispatch mexanizmi odatda Objective-C ning standart dinamik chaqirish tizimini o'tkazib yuborish bilan bog'liq bo'lib, metod chaqirishlarni optimallashtirishga qaratilgan. Bunday mexanizmni sinfda amalga oshirish uchun, funktsiyalarga to'g'ridan-to'g'ri chaqirish yoki metod ko'rsatkichlaridan foydalanish mumkin, bu esa dinamik selector qidiruvining ortiqchasini oldini oladi.

Amalga oshirish misoli, funktsiya ko'rsatkichini saqlash va uni to'g'ridan-to'g'ri chaqirishni o'z ichiga olishi mumkin:

typedef void (*DirectMethod)(id self, SEL _cmd);

@interface MyClass : NSObject {
    DirectMethod directMethod;
}
- (void)setupDirectDispatch;
- (void)directMethodImplementation;
@end

@implementation MyClass

- (void)setupDirectDispatch {
    directMethod = (DirectMethod)[self methodForSelector:@selector(directMethodImplementation)];
}

- (void)callDirectMethod {
    if (directMethod) {
        directMethod(self, @selector(directMethodImplementation));
    }
}

- (void)directMethodImplementation {
    NSLog(@"To'g'ridan-to'g'ri dispatch metod chaqirildi");
}

@end

Shu tarzda, callDirectMethod chaqiruvi standart objc_msgSend mexanizmini o'tkazib yuboradi, bu esa muhim joylarda ishlashni yaxshilashi mumkin. Biroq, bu yondashuvni ehtiyotkorlik bilan qo'llash tavsiya etiladi, chunki u moslashuvchanlikni kamaytiradi va metod o'zgartirilsa, xatolarga olib kelishi mumkin.